mfd: Make symbol 'atc260x_i2c_of_match' static

The sparse tool complains as follows:

drivers/mfd/atc260x-i2c.c:45:27: warning:
 symbol 'atc260x_i2c_of_match' was not declared. Should it be static?

This symbol is not used outside of atc260x-i2c.c, so this
commit marks it static.

Fixes: f7cb7fe3 ("mfd: Add MFD driver for ATC260x PMICs")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/atc260x-i2c.c

@@ -42,7 +42,7 @@ static int atc260x_i2c_probe(struct i2c_client *client,
 	return atc260x_device_probe(atc260x);
 }
 
-const struct of_device_id atc260x_i2c_of_match[] = {
+static const struct of_device_id atc260x_i2c_of_match[] = {
 	{ .compatible = "actions,atc2603c", .data = (void *)ATC2603C },
 	{ .compatible = "actions,atc2609a", .data = (void *)ATC2609A },
 	{ }